Abrading wheel



June 13., 1944. THOMP N 2,351,561

ABRADING WHEEL Filed Oct. 14, 1942 Patented June 13, 1944 UNITED STATES PATENT OFFICE ABRADING WHEEL Loren E. Thompson, Parkersburg, W.'Va.

Application October 14, 1942, Serial No. 462,009

1 Claim. (01. 51-209) This invention relates to abrading grindin wheels, and is a division of my co-pending application Serial Number 309,290, filed December 14, 1939, for Abrading apparatus.

An object of this invention is to provide a new and. improved means for mounting an abrader wheel or disc in a holder.

Another object of this invention is to provide an improved chuck for removably holding an abrader disc.

A further object of this invention is to provide an improved holder for a surfacing abrader in which the holder is constructed in the form of a flanged plate provided with releasable clamping means for the abrader, the holder being of such construction that when the abrader is mounted therein the abrader can be used in precision grinding.

The invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawing, wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawing:

Figure 1 is a fragmentary front elevation, partly in section, of an abrader and chuck constructed according to the embodiment of this invention,

Figure 2 is a sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a fragmentary sectional view taken on the line 33 of Figure l, and

Figure 4 is a fragmentary enlarged sectional view showing one of the abrader clamping members.

Referring to the drawing, the character G designates a holder consisting of a circular disc-like body I having a rearwardly directed centrally disposed reinforcing portion 2 which is of circular form and tapered. The body I is formed axially thereof with a threaded bore 3 for a purpose to be referred to. The bore 3 extends from the rear surface of portion 2 to the forward face 4 of body I. Formed integral with the outer marginal portion of the forward face 4 and flush with the outer edge of body I is a forwardly directed annular rim 5 provided at equi-distant spaced points with inwardly opening pockets 6 (Figure 4) preferably four in number It is to be understood that the number of pockets 6 may be as desired.

combined centering and holding members I, for a. purpose to be referred to. The members I are of a contour corresponding to the segment of a circle and are mounted slidably in the pockets 6 for adjustment. The members I are of uniform thickness and each is of rectangular contour in transverse cross section. The inner and outer faces 8 and 9 of each member "I are of greater width than the side surfaces Ill and II of the latter. The inner surface 8 of each member I is the working face thereof. The rim 4 is formed with spaced pairs of spaced threaded openings. The openings of each pair are indicated at l2 and I3 and extend from the outer side face of rim 4 to and communicate with a pocket 6 at the base of the latter.

Threadedly engaging with the openings I2, I3 of each pair is a pair of combined adjusting and clamping screws l4, I5, respectively, for a memher I. A pair of screws l4, I5 abut the outer face of a member I for shifting it relative to an abrader or grinder I6 arranged in holder G, for adjusting abrader I6 to center it with respect to said holder G and for maintaining the abrader I6 in its adjusted position. The abrader I6 is in the form of a circular body I! of any suitable abrading material and is of a thickness to project outwardly with respect to the forward edge I8 of the rim 5. Encompassing the abrader I6 and of a width to extend from the forward face 4 of body I to the edge l8 of rim 5 is a thin annular liner I 9 against which the members I bear. The liner l9 opposes the edge 22 of rim 5. Preferably, the liner I9 will be formed of paper, but it is to be understood that it may be formed from any suitable material.

The rim 5 in connection with the body I forms a circular cavity 2|, with the base wall and side wall of the latter provided, respectively, by the forward face 4 of body I and the inner edge 22 of rim 5. The liner I9 is arranged against the edge 22 before the abrader I6 is mounted in holder G. After the liner l9 has been arranged relative to rim 5, the abrader I6 is then pressed into the holder G against the liner I 9 and to an extent to engage the forward face of body I. This manner of mounting abrader I6 compresses and provides for the liner l9 sealing the abrader l6 in the cavity 2| with a vacuum tight grip.

The abrader I6 is in the form of an emery or carborundum wheel and is bored axially as at 23. The outer diameter of the abrader I6 with respect to the diameter of the cavity 2| is such that when abrader I6 is pressed into the holder Arranged within the pockets 6 are adjustable G, it will provide for wedgingly binding the liner IS in encompassing relation with respect to the abrader and against the rim. The members 1 also act on the liner I9 in a manner to prevent the abrader l6 from slipping or turning inside of and relative to holder G when a severe thrust is applied at or near the rim of such holder.

In the use and operation of the abrading element G, the liner I9 is placed in the socket or recess 2| formed by the annular flange or rim 5. The clamping segments 1 are retracted by loosening the clamping screws I4 and I5, and then the abrader I6 is pressed into the socket 2|. The screws l4 and I5 are then tightened to force the segments 1 inwardly against the liner l9 and press the liner l9 against the cylindrical outer side of the abrader I6. The abrader I6 has a thickness in excess of the depth of the socket 2| so that a. sufficient amount of the abrader l6 projects outwardly of the flange 5 to provide a grinding or surfacing face, it being understood 20 that the outer end or face of the abrader l6 constitutes the working face.

What I claim is:

In combination, a holder formed of a discshaped body, an annular flange carried by said body, a disc-shaped abrader seated in said flange and having a portion thereof projecting from said flange, a fibrous liner fixed to the periphery of said abrader, said flange having a plurality of inwardly opening circumferentially spaced apart recesses therein, segmental clamping members slidably mounted in said recesses, and set screws threaded through said flange from the outer side thereof engaging against said clamping members for holding the latter tight against said liner, said set screws at their outer ends terminating substantially flush With the outer surface of said flange.

LOREN E. THOMPSON. 

